Hot/Cold water pipe lost a little bit pressure over 4 weeks - normal?

[loveextasy]

Hi,

I have recently replaced a conventional boiler with a combi one about 2.5 months ago, and was a little bit worried about leaking when changing from low to high pressure system.

And I used the 4 weeks' of holiday to test it - by turning off the mains water supply 4 weeks ago, and check if the water from tap is as powerful as it should (what I believe is, even the mains is off, the pressure from the tap should be as powerful as usual at first instance, then reduced to some level of low pressure flow).

Unfortunately when I came back today and turned the tap with mains still off, the tap flow is already low pressure, as of about 1-1.5 seconds later from what I'd expected.

I am just wondering if anyone knows it is normal, or does it means of anywhere leaking in my house that is too little or hidden to be found?

Thanks a lot!

Regards.

 

[Dan Robinson]

Any chance of getting this in English?

 

[Daveydub]

What?
????

 

[TCCHeating]

Eh?

 

[Daveydub]

The clue may be in the name I suppose

 

[HERTS P&D]

So you lived in your house with no water for a month?

Has anyone mentioned the 'smell'

Andy

 

[loveextasy]

I'm sorry I'm not a native Engilish speaker.....hope I can get it described as much as I could, but seems I failed

 

[MrGassafe]

Mmmmmm. 1st wind up of 2016 perhaps?

 

[loveextasy]

So you lived in your house with no water for a month?

Has anyone mentioned the 'smell'

Andy

Hi,

Thanks for your reply.

No, I actually went on holiday 4 weeks ago, and turned the mains off on the day I left, and tested the tap's pressure today when I got back home with mains still off....and the tap's pressure is not as strong as when the mains is on.

I did another test by turning the mains back on again, waiting for the water to fill in the pipe, then turn the mains off again, and tested the tap's pressure, and the immediate pressure from tap is strong....

Hope this makes sense though

Thanks again!

 

[TCCHeating]

Sounds like your stop tap isn't fully turning off

 

[Daveydub]

I think that you are saying that with the stop-tap off, when you open a tap you get a little spurt of water and then flow stops. This is due to a bit of air, compressed in the pipework, forcing water out of the tap when opened. That this air is still not present after 4 weeks should not alarm you. It may have been absorbed or lost through taps, ball valves, connections. The fact that a tap (etc) does not drip water does not mean that it will hold air for 4 weeks.

 

[loveextasy]

Thanks TCCHeating

I think the water should be continue to come out from the tap if the mains stop isn't fully off? In my case the pressure is decreasing and after about 10-15 seconds there'll be no water coming out.

 

[TCCHeating]

Thanks TCCHeating

I think the water should be continue to come out from the tap if the mains stop isn't fully off? In my case the pressure is decreasing and after about 10-15 seconds there'll be no water coming out.

Perfectly normal then.

 

[loveextasy]

I think that you are saying that with the stop-tap off, when you open a tap you get a little spurt of water and then flow stops. This is due to a bit of air, compressed in the pipework, forcing water out of the tap when opened. That this air is still not present after 4 weeks should not alarm you. It may have been absorbed or lost through taps, ball valves, connections. The fact that a tap (etc) does not drip water does not mean that it will hold air for 4 weeks.

Thanks very much! That's exactly what I mean! And your answer gives me a big relief Actually what I see from the tap is I get a spurt of water, then the water pressure is decreasing as it come from the loft tank and decreasing, and finally no water after 10-15 seconds.

Sorry I may be too worried about the potential of leaking when changing to high pressure system, and did not know that there is air in the pipework....I thought it is only water in the pipework.....

Anyway, thanks again for your answer and gives me a big relief

 

[Dan Robinson]

Dōitashimashite